How to be a savvy Amazon shopper, whether you buy on Cyber Monday or another time of the year.

It’s a prime time for deals.

An estimated 75 million people will shop on Cyber Monday, according to the National Retail Federation, and online spending could top $3 billion, according to Mastercard SpendingPulse. Amazon is poised to take in a big chunk of their spend. Indeed, a survey from BlackFriday.com found that 32% of shoppers think Amazon will have the best deals on Monday, compared to 24% for Walmart and 15% for Target.